Spark plug



J. CECCON April 2, 1940.

SPARK PLUG Filed Aug. 30, 1939 2 Sheets-Sheet 1 w 0 c y. C

- Aprilz, 1940; I 7.1. CECCON 2,195,953

S PARK PLUG Filed Aug. 30. 1959 2 Sheets-Sheet 2 Patented Apr. 2, 1940This invention relates to improvements in spark plugs and moreparticularly to that type of spark plug wherein the electrodes in thesame are ad- .iustable.

An object of the invention is to provide a spark plug wherein the sparkgap may be ad J'usted.

- Another object of the invention is to provide a spark plug .whereinthe spark gap may be' adjusted while the spark plug is mounted in aninternal combustion engine or other device.

Allof the foregoing and still further objects and advantages of theinvention will become apparent from a study of' the followingspecification, taken in connection with the accompanyingdrawings,wherein like characters of reference designate corresponding. partsthroughout the several views, and wherein:

Figure 1 is an elevational view of a device embodying my invention.

Fig. 2 is a vertical transverse sectional view of the invention. Fig. 3is' an holder.

Fig. 4 is a transverse sectional'view taken substantially on the line4-4 of Fig. 3. Fig. 5 is a top plan view of the device with-th terminalcap removed.

- Fig. 6 is a transverse sectional view taken substantially on the line6-6 of Fig. 2, and

Fig. 7 is an elevational view of the adjustable electrode.

Referringnow to the drawings, in detail, it will be seen that thereference numeral l0 designates the usual housing nut provided with athreaded tubular shank -II for securing the same in an internalcombustion engine (not shown). The shank I I has secured to andextending from the bottom edge thereof, an L-shaped electrode- Mountedin the housing nut l0 and sealed therein by gaskets I3 and I4, is adielectric elec-' trode holder l5 having a. smooth b reJG which enlargesto form a pocket I}. The top portion of the dielectric electrode holderhas anchored therein a metallic member 18 of tubular constructionwherein the bore thereof is threaded as at I9. This tubular metallicmember 18 is provided at its top end portion with threads 20 and aflange 2| while its bottom end portion has formed in the 'side surfacesthereof pockets 22. This pocketed portion has a baked porcelain coating.

elevational view of one electrode 2,195.95: smax ewe Y n Ceceon. Moran',Iowa Application August .30; 1939', Serial mnzazaoi 2 Claims.(Ol..123169) just'edposition.

23 and I2 may be varied.

adjustment is made.

Although I have shown a threaded .bore I3. I A kerf 25 is cut in the topend of the electrode 23 forengagement with a screw driver orotherlmanipulating tool when an adjustment of the electrode is to bemade. After adjustment a lock nut 26 is threaded on the I electrode 23to securely hold the same in ad- A conductor terminal in the form of an'internally threaded cap 21 having a headed post 28 pro-'- jectingtherefrom-is screwed onto the threads 20 of the tubular member IE tocover the top end of the electrode 23. A gasket 29 is mounted betweenthe bottom end of the cap 21 and the flange 2!.

When the spark gap between the bottom end of the electrode 23 andL-shaped electrode l2 becomes so great as to diminish the efliciency ofthe spark plug or to render it inoperative, it isunnecessary to removethe plug fromthe engine or other. device in order to. reset theelectrode.

The cap 21 is removed, the lock nut 26 unscrewed, and by screwing .theelectrode 23in or out of the member It the distance between theelectrodes The pocket I! is provided receive the enlarged portion 24 ofthe electrode 23 when an nd describedherein a preferred embodiment of myinvention, it is to be definitely understood that. I do. not desire tolimit the application of the invention thereto, and any change orchanges may be made'in the materials andin the structure and arrangementas claimed.

What is claimed is:

of electric current.

of,the parts. within the spirit of the invention '1. In a device of the;character described, a spark plug including a. housing nut member, anelectrode mounted on said housing nut 'member, a dielectric memberhaving a small bore and a counterbore m'ounted'in said housing nutmember, an electric conducting member mounted in v and anchored to thewalls of'said counterbore, an electrode adjustably mounted in saidelectric conducting member and extending through said small bore at oneend portion and extendingbeyond said electric conducting member at itsother end portion, a cap mounted on said electric conducting member andover -'said electrode, and apost on saidcap for connection with a sourceducting member at its other end portion, a cap mounted on said electricconducting member and over said extending electrode portion, and a poston said cap for connection with a. source of electric current.

JOE CECCON.

